. >> i do believe in the green environment tally sound policies. >> reporter: brian mcvay was once proud of his job. he was a supervisor at recology. two buy back centers have helped san francisco reach an 80% recycling rate. the highest in the nation. but at this buy back center on tunnel road, brian says there were problems. so he installed surveillance cameras to keep an eye on things. >> there is the attendant. she going to weigh the material. >> reporter: he estimates that was about two pounds of plastic and three pounds of aluminum but the report from that transaction shows something different. 68 pounds of plastic and 47 pounds of aluminum. then, off the customer goes to get his cash to later split with his buddy, the employee. >> and this is an example of what went on all day. >> reporter: in 2007, company records show 6.3 million pounds of bottles and cans taken in for recycling. but only 1.4 million pounds leaving for processing. armed with the evidence, brian took his findings to management but he was told to back off. even threatened. >> i was told people in the company wante